The object is deleted, but Ctrl Z (undo) does not restore it.
None of the Delete functions can be undone.
Paint operations can be undone with Ctrl Z, but Ctrl Y (Redo) does not restore them.
Just do not make mistakes.

Once i figure out a way to differentiate when you painted and when you delete something, ill be adding that. Undo/redo is one of those mystic arts that i am still learning about lol